A position sensor device includes position sensor elements for generating analog sense signals. A digitization circuit is provided for a digital signal representative of the input phase based on the analog sense signals and a digital processing unit. An output signal is indicative of the position based on the first output of the processing unit. The processing unit comprises an error signal generator for computing an error signal indicative of a phase difference between the digital signal and a feedback signal. A digital filter filters the error signal to generate the first output. A feedback path provides the feedback signal based on the first output and a filter selector to select a filter to be applied from different filters. At least one input on which a common filter circuit operates is scaled differently for each of the different filters to select different filter bandwidths.

An offset correction device includes: an amplitude adjuster that adjusts an amplitude of a detection signal output from an encoder by adjusting a gain of the detection signal so that the amplitude is within a predetermined range; an offset corrector that corrects an offset of an amplitude center of the detection signal; and a storage that stores a relationship between the gain and an offset amount in advance, wherein the offset corrector refers to the relationship stored in the storage when the amplitude adjuster changes the gain, obtains the offset amount corresponding to the changed gain, and corrects the offset based on the obtained offset amount.

The invention relates to a crankshaft, transmission or camshaft sensor (10) for a motor vehicle, intended for being connected to an engine control unit (30) by a cable (20). The sensor comprises a processing module (17) and a voltage-modifying circuit (18) configured to generate an output signal via an output port (12) of the sensor (10) allowing a diagnosis module (36) of the engine control unit (30) to detect and identify faults of the sensor (10) or the cable (20). In particular, the processing module (17) is configured to provide on its output port (172), when the toothed target (14) is immobile, a predetermined pattern representing the fact that the toothed target (14) is immobile, this predetermined pattern corresponding to a status change of the output port (172) of the processing module (17) with a predetermined time and repeated periodically. The invention likewise relates to a diagnosis system (1) comprising such a sensor (10), a cable (20) and an engine control unit (30). The invention also relates to a diagnosis method (50) implemented by said diagnosis system (1).

A method for using a system including a plurality of first fields and a plurality of second fields fixed to a first device and presenting a first physical characteristic and a second physical characteristic, respectively, the first and second fields being arranged in an alternating manner. First and second sensors are fixed to the second device and arranged to move along the array of fields when the second device moves in relation to the first device. The method includes detecting, by the first sensor and during a movement of the second device in relation to the first device, a transition from the first to the second physical characteristic, or vice versa, simultaneously detecting, by the second sensor, the first or the second physical characteristic, and determining, based on the detected transition and physical characteristic, the direction of movement of the second device in relation to the first device.

A linear rotary encoder includes a pair of rotational surfaces. A contact belt has a first end coupled to a first rotational surface in the pair and a second end coupled to a second rotational surface in the pair. The contact belt is driven to rotate around the pair of rotational surfaces by a driving force applied to media to move the media from the first end toward the second end. An encoding scale is coupled to an inner surface of the contact belt. A reader is positioned to read the encoding scale as the contact belt rotates around the pair of rotational surfaces. The reader generates an output signal indicating a position of the media based on reading of the encoding scale.

In one aspect, an integrated circuit (IC) includes a magnetic-field sensor. The magnetic field sensor includes a first and second magnetoresistance circuitries configured to receive a magnetic field signal from a target and convert the magnetic field signal received to a first signal and second signal; analog circuitry configured to receive the first and second signals; digital circuitry configured to receive a first and second analog output signals from analog circuitry and to convert the first and second analog output signals to a first and second digital signals representing a first and second channel output signals; and diagnostic circuitry configured to receive, from the digital circuitry, an input signal related to a separation of the first and second channel output signals, and configured to provide a test signal at a pin of the IC indicating whether a distance between the IC and the target complies with at least one rule.

In one aspect, an integrated circuit (IC) includes a magnetic-field sensor. The magnetic field sensor includes a first and second magnetoresistance circuitries configured to receive a magnetic field signal from a target and convert the magnetic field signal received to a first signal and second signal; analog circuitry configured to receive the first and second signals; digital circuitry configured to receive a first and second analog output signals from analog circuitry and to convert the first and second analog output signals to a first and second digital signals representing a first and second channel output signals; and diagnostic circuitry configured to receive, from the digital circuitry, an input signal related to a separation of the first and second channel output signals, and configured to provide a test signal at a pin of the IC indicating whether a distance between the IC and the target complies with at least one rule.

An apparatus for estimating a motor RPM in an electronic brake system may include: a current signal amplifier configured to amplify a voltage applied across a motor driver by a current which flows while the motor driver is turned on, the motor driver being included in a motor driving circuit configured to apply motor driving power to a motor or remove the motor driving power according to a switch-on/off of the motor driver; and a controller configured to detect a waveform with a one-period time from periodically repeated waveforms by processing the signal waveform amplified by the current signal amplifier, calculate a one-rotation time based on the one-period time and the number of commutators of the motor, and calculate a motor RPM using the one-rotation time.

Method of determining a position of a sensor device relative to a magnetic source, includes: a) determining a first and a second magnetic field component at a first sensor location; b) determining a third and a fourth magnetic field component at a second sensor location; c) determining a first difference of the first and third component, and determining a second difference of the second and fourth component, and determining a first angle based on a ratio of the first and second difference; d) determining a first sum of the first and third component, and determining a second sum of the second and fourth component; e) determining a second angle based on a ratio of said first and second sum; f) comparing the first and second angle to detect error.

A method for detecting the position of a movable part, in particular for detecting the angular position of a rotatably mounted part or for detecting the linear position of a part arranged to be linearly movable, by means of a sensor which, as sensor signals coding the position, has a first signal, in particular a sine signal, and a second signal, in particular a cosine signal, in particular wherein the position detected by the sensor is coded by means of the first and second signal, wherein an actual variable is determined from the sensor signals in a chronologically recurring manner, wherein the determination of a control value, in particular a respective updated control value, is triggered by a trigger signal, in particular a respective trigger signal, in particular by a trigger pulse, wherein the determination of the control value is executed in such a way that the actual variable is regulated toward a target variable, in particular wherein the control value first changes with the respective next determination triggered by a respective further trigger signal, in particular wherein the control value determined by the determination triggered by the trigger signal remains unchanged until the chronologically successive and/or respective further trigger signal.

In a method for detecting the position of a movable part by a sensor which, as sensor signals coding the position, has a first signal and a second signal, the position detected by the sensor is coded by the first and second signal, an actual variable is determined from the sensor signals in a chronologically recurring manner, the determination of a control value is triggered by a trigger signal, the determination of the control value is executed such that the actual variable is regulated toward a target variable.